feat: use vim.ui.select for 'pick one prompts`

[oysandvik94]

Does this: #500

Part of this: #358

I guess multiselect depends on this:

neovim/neovim#18161

[Pistonight]

This looks like exactly what I need. What's blocking this from being merged?

[Jouo]

@mfussenegger What are the chances of merging this?

[mfussenegger]

Not sure, I haven't made up my mind yet how to deal with this.

Some of the functionality assumes that the buffer remains visible but vim.ui.select is often implemented as floating window that hides the buffer content.
That makes the disambiguation logic for organizing imports less useful. Currently it jumps and highlights to the expressions for which you're prompted to choose an import.